Northern Harrier Identification Guide

Overview

The Northern Harrier (Circus hudsonius) is a slender, long-tailed hawk of open country — marshes, grasslands, and agricultural fields — found across North America. Its low, buoyant hunting flight and owl-like facial disc (used to hear prey, much like an owl) set it apart from every other North American raptor.

Key Field Marks

• Size & shape: A slim, long-winged, long-tailed raptor, 18–20 inches long with a wingspan around 3.5–4 feet; wings are held in a shallow V (dihedral) in flight, similar to a Turkey Vulture but with a much more buoyant, tilting flight style.
• White rump: A bold white patch at the base of the tail is visible on all ages and both sexes and is the single best field mark, obvious even at a distance or in poor light.
• Facial disc: An owl-like ruff of stiff feathers around the face helps funnel sound to the ears, aiding this species' unusual reliance on hearing to locate prey in dense grass.
• Male plumage: Pale gray above and white below with black wingtips, earning the nickname "gray ghost."
• Female plumage: Larger than the male, brown above and heavily streaked buffy-brown below.
• Juvenile plumage: Similar to female but with an unstreaked, warm rufous-orange breast and belly.
• Behavior: Hunts by flying low and slow over open fields and marshes, tilting side to side on raised wings, then dropping suddenly onto prey detected by sound or sight; often roosts communally on the ground in winter.

Similar Species

• Turkey Vulture also flies with wings in a dihedral and rocks side to side, but is much larger, entirely blackish with silvery flight feathers, has a small bare red head, and lacks the harrier's white rump.
• Rough-legged Hawk and other buteos have broader wings, soar higher, and lack the harrier's low coursing flight and facial disc.
• Short-eared Owl, which shares open-country habitat and low flapping flight, especially at dusk, lacks the white rump and has rounder wings and a more moth-like wingbeat.

Where & When to Find One

Northern Harriers breed in open marshes, prairies, and grasslands across most of Canada and the northern U.S., wintering more broadly across the southern and central U.S. south to Mexico and Central America. They favor treeless, open habitats — coastal marshes, hay fields, prairie, and airport grasslands are especially reliable. Look for them cruising low over such open ground at any time of day, though activity often peaks in early morning and late afternoon.

Voice

Generally quiet away from the nest; near the breeding territory gives a sharp, repeated, nasal "kek-kek-kek-kek" alarm call, and a shrill whistled "pee-ee" during food exchanges between mates.